蚯蚓对猪粪重金属Cu、Zn的吸收及影响因素研究  

Study on Cu and Zn Uptake in Pig Manure by Earthworm (Eisenia foetida) and Its Influencing Factors

作　　者：吴国英[1] 贾秀英[1] 郭丹[1] 来凯凯[1] 姜洪芳[1] 

机构地区：[1]杭州师范大学生命与环境科学学院,浙江杭州310036

出　　处：《农业环境科学学报》2009年第6期1293-1297,共5页Journal of Agro-Environment Science

基　　金：浙江省科技厅计划项目(2007C23041)

摘　　要：由于饲料添加剂的使用，猪粪重金属污染已非常普遍，尤其是铜（Cu）、锌（Zn）污染最为明显。为了探讨利用蚯蚓萃取猪粪重金属Cu、Zn从而减少猪粪中重金属Cu、Zn含量的技术途径，采用室内接种法研究了赤子爱胜蚓（Eisenia foetida）对猪粪重金属Cu、Zn的吸收及影响因素。结果表明，蚯蚓对猪粪重金属Cu、Zn具有一定的吸收能力，富集系数分别为0.43、0.73; 物料C/N比、温度、湿度和蚯蚓接种密度均能影响蚯蚓对猪粪重金属Cu、Zn的吸收，在物料C/N比为17∶1～22∶1、温度为14-21℃、湿度为70%-75%、接种密度为10-20尾·200 g^-1物料（2.4-5.0 g·200 g^-1物料）条件下，蚯蚓对Cu、Zn的吸收量较高。Use of additives containing heavy metal in animal feeds and heavy metals（e.g. Cu and Zn） in pig manure is ubiquitous causing a serious pollution hazard. It is assumed that earthworm acts like a bioreactor that likely removes heavy metal from pig manure. However, limited information is available on the heavy metal extracting ability of earthworms. The objective of this study was to assess the effect of earthworm presence on Cu and Zn uptake from pig manure and its influencing factors such as C/N ratio, temperature, humidity and inoculated density. After collection, manure was blended with straw to cultivate earthworm（Eiseniafoetida） under different conditions. The results showed that earthworm could accumulate Cu and Zn from pig manure, and the bioaccumulation coefficient of Cu and Zn was 0.43 and 0.73, respectively. The C/N ratio, temperature, humidity and inoculated density were supposed to greatly influence on accumulation of Cu and Zn in pig manure by earthworms. The optimal conditions were the C/N ratio of 17：1-22：1, temperature 14-21 ℃, humidity 70%-75% and inoculation density of 10-20 earthworms per 200 g manure（as dry weight）（i.e. 4.59 g earthworm per 200 g manure）. It is concluded that the earthworm bioaecumulation could be used as alternative method to remove heavy metal from pig manure.

关 键 词：蚯蚓 猪粪 铜 锌 

分 类 号：X174[环境科学与工程—环境科学]